Mine started laying recently. They had a brief stoppage, while I was away this weekend. I asked hubby what happened. He said, "Nothing, just yard work." It turned out he hired a gardener to do a bunch of work near the hens. I think they were disturbed by the activity. Also, I noticed their water dish was empty. Upon my return, the work was done, the water re-filled, and the Chicks provided me with a "Welcome Home" omelet.
As a matter of note, 2 of the 3 are laying. One (soon to be Sunday dinner!), is holding out on me. I don't know why.
Hang in there, don't get discouraged, they'll lay. They just need light, safety, water and a suitable nesting area. Be patient.